Due to the one-way circulation patterns of the square, Route 2A follows Mass Ave in the westbound direction and a combination of Massachusetts Avenue, Brattle Street, and Mt.

In 2013, Route 2A signs were extended 2.2 miles (3.5 km) further into Boston through the Back Bay and South End neighborhoods along Massachusetts Avenue.

On February 26, Boston television station, WFXT-TV aired an investigative reporting segment showing the incorrect signs and their attempt to track down the source.

In the report, Boston transportation officials admitted they had paid a private firm, Jacobs Engineering, to manufacture and put up the signs through a wayfinding improvement grant.

The signage errors were caused by problems with the plans developed by Jacobs that apparently were not checked for accuracy before they were approved for installation by the city.

[3] Meanwhile, a MassDOT official reiterated that the eastern terminus of Route 2A is at the intersection of Massachusetts and Commonwealth Avenue and that crews would be removing the MA 2A signs further east.